APHIDID.E. 269 



will generally be found that they are the progeny of a single parent, 

 congregated, as it Avere, together before leaving "home." 



Calliptehus betulakils (Kalt.) 



This species is very abundant on birch-trees, more especially l)irch 

 coppice, during the summer months, and great numbers of it may be 

 beaten from the foliage. The winged specimens are rather sluggish 

 in their motions, and do not take willingly to flight. 



The apterous viviparous female is linear in form ; the body is almost 

 entirely green, with slight yellowish colouring in the anterior parts. 

 The head is slightly covered with hairs ; eyes red ; antennae are very 

 slender. 



The Avinged viviparous female is of a light pea-green colour, and 

 more smooth on the body than the apterous specimens ; antennae very 

 long and slender, and of a slightly brown colour. The third joint is 

 very long. The middle portion of the thorax is yellow-orange spotted 

 with brown. The front portion of the thorax is of a light-yellow 

 colour ; eyes beautiful light chocolate ; legs uniformly light green, 

 except the tarsus, which is dark brown. Wings moderately long 

 and clear; stigmatic portion yellow ; veins dark brown, and slightly 

 clouded at the tips. 



Callipterus quercOs (Kalt.) 



This species is found fairly common under oak leaves. The apter- 

 ous oviparous female is a light-yellow colour. Antennae shorter than 

 the body. Eyes brown. The Avinged viviparous female is of a pale- 

 green colour, leaning towards yellow. The anteiintie comparatively 

 long, and the joints marked with a blackish colour, — a character 

 which is Avell maintained in mounted specimens. 



The young of this insect are at first very small and light-coloured, 

 with conspicuously darkish or reddish eyes. These characters can be 

 very well ascertained with the aid of a pocket-lens against the leaf 

 as a background. 



The more common species which may be looked for are the fol- 

 lowing — viz. : Callipterus coryli, Goetze, on hazel ; Calliptenis 

 carpini, on hornbeam ; and CaJlipteru'< rastanea', Buckton, on sweet 

 chestnut. 



